Testing parallel mode and PR34106

[Benjamin Kosnik]

Sorry if this is duped. I guess I cannot use gmail to send patches
anymore! 

> FAIL: 26_numerics/partial_sum/requirements/explicit_instantiation/2.cc
> (test for excess errors)
> 
> which seems only due to the missing inclusion of <new>, necessary for
> placement new.
> 
> While we are at it, I would probably also suggest to qualify such
> placement new calls with ::new, per DR 402.

The attached patch does this.

-benjamin
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